Wednesday, March 17, 2004

Permafrost, Air temperature and ground temperature

In areas where the mean annual air temperature becomes colder than 0° C, some of the ground frozen in the winter will not be completely thawed in the summer; therefore, a layer of permafrost will form and continue to grow downward gradually each year from the seasonally frozen ground. The permafrost layer will become thicker each winter, its thickness controlled by


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